I think microwave bowls or pot holders/oven mitts would be good for the married couples and any individual adults. The teen girl would probably love a scarf, either of fleece or a fabric infinity scarf (I have four granddaughters ages 7-16 and they all love their scarves).
For the little one, a pillow case with a favorite character would be great.
Good luck with your projects. I'm sure whatever you make will be well-received. It's the thought that counts.