It's pouring rain this Saturday in Bosto

Let me verify the venue facts against official sources before drafting.

Boston Children's Museum (308 Congress St, Fort Point) is your best fit — fully indoor across three floors, elevator + ramp access, benches scattered through every exhibit, on-site parking validation at four nearby garages, and a dedicated Kids Space for under-4s that grandma can watch from a bench while your son explores an enclosed safe area.

Why it fits your party

• 100% indoor; you never step outside to move between exhibits
• Benches line most exhibit edges so grandma can sit within arm's reach of the play zones
• Elevator to upper floors — skip them if grandma's tired; the ground floor alone (Kids Space, water-play room, the quiet Japanese House) fills 90 minutes easily
• On-site café for coffee + restroom breaks; ADA restrooms on every floorParking to know (from the museum's own page)

The museum validates paper tickets at four garages: Stillings St, Farnsworth St, Atlantic Wharf (weekends + weekdays after 10am), and Seaport South (weekends). Insert a card at the entry gate even if you'd rather pay with the app — they cannot validate app/Q tickets. Bring the paper ticket to the front desk for validation.

Hours + admission (verified on BCM site today,9/17)
Wed–Mon, 9am–4pm; closed Tuesdays. Admission $24 adults / $24 kids 1–15 / free under 12 months. The site's maintenance notice closed them Tuesday 9/8 through Thursday 9/17 — so by Saturday 9/19 they should be open, but please re-check that morning since the closure was very recent.

Backup if you want free parking + a flatter walk: LEGOLEND Discovery Center at Assembly ow in Somerville — one level, 3 hours free parking at the adjacent Artisan West Garage, DUPLO toddler area, LEGO Café, and the connected Assembly ow mall has covered seating and restaurants if grandma needs a longer sit-down. Hours 10am–5pm, last entry 3:30pm. Smaller footprint, easier parking, but a shorter visit.

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Afternoon at home — safe together from the couch or a floor mat

Set the ground rules before toddler and grandma sit down together:

> Off-limits in toddler reach: coins, button/coin batteries, beads, marbles, small Lego pieces, whole grapes, nuts, popcorn, scissors, hot-glue guns, candles, the stove, the microwave, any craft knife, magnets small enough to swallow.

Move small items up high and give grandma a covered cup for her hot drink.

Best activities, all zero-hazard:

• Picture-book reading — grandma holds the book, toddler turns the pages
• Magnetic tiles (large pieces only) — build towers side by side
• Play-Doh sculpting — knead, roll, stamp with kitchen items; non-toxic, nothing to swallow except the dough itself (supervised)
• Old family photo album — grandma narrates, toddler points and asks; powerful bonding
• Sing-along + hand-clapping games — nursery rhymes, patty-cake; grandma teaches, toddler copies
• Sticker book, large stickers only — round or big shapes, no tiny peel-offs

Skip any craft involving scissors, glue, buttons, or beads; any snack that needs cutting; any "kitchen helper" task near the stove.

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Saturday morning checklist (verify on official sites the day of)

• [ ] Weather recheck — weather.gov Boston or your weather app; confirm rain timing and check for thunderstorm warnings (lightning = stay home)
• [ ] Museum status — bostonchildrensmuseum.org/visit for that day's hours and any new closure
• [ ] Tickets — buy online in advance; weekend slots can sell out
• [ ] Parking garage — confirm Stillings or Farnsworth open and not full; Saturday Seaport events fill garages
• [ ] Pack — grandma's cane (+ a foldable cushion if she has one), toddler snack + water, a spare set of clothes (the water-play room is wet), a small towel
• [ ] Stroller — bring it for toddler so he rides when tired; museum is stroller-friendly
• [ ] Backup escape — South Station is a 5-min flat walk if rain turns to a thunderstorm or grandma needs to bail; food-court seating and step-free access
• [ ] Pre-home clear-up — before grandma and toddler sit down: clear coins, batteries, small magnets, beads, small Lego pieces off the floor; cover grandma's hot drink

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One honest limit: the weather tool didn't return a Saturday hourly forecast for Boston — only a "fair night" reading for right now. Trust your own forecast; recheck weather.gov Saturday morning before leaving. The museum's recent 9/8–9/17 maintenance closure ended yesterday, so Saturday should be open, but I'd confirm that morning given how recent the closure was.

Want me to render a one-page PDF of this plan (the morning anchor, the home activity list, and the checklist) you can hand to your partner?