Backstory: With the stay at home quarantine, families are spending more time together. Everyone is becoming more accustom to being in close quarters together. This is going to lead to more game nights and creative activities together.
The Idea: A family fun subscription box.
Deep Dive: You would build a fun game box for families. You have to come up with puzzles, riddles, scavenger hunts and escape room style games that are family friendly. Give the wide area of possibilities, you should niche down into something you're passionate about. Also keep in mind UGC (user generated content), making these games creative will help.
One niche that could do well is arts and crafts. You could theme each box with genres like western, midievil times and the industrial age. Each box could span a time period, teaching information to the younger kids while building creative items.
Validation: https://www.littlepassports.com/ does a good job of this, focusing on science and global adventure.
Monetization: You would charge a monthly subscription for this service. You could have varying prices based on the number of kids in the family.
Steps to Launch: Start with an easy topic that has an existing content base. Take a western themed box... you could find a bunch of coloring books, cut-out items like a cowboy hat and indian feathers. You could also construct a fun family "cowboys and Indians" game that everyone can play together. Finding passion in this type of box will help lead to its success.