Are mice good with children? Older children tend to do best. Mice are tiny prey animals so they do not handle rough handling well. Also, bonding with them takes time. You should get them used to you having your hand in the cage and hand feeding treats before you even try to get them out of the cage. This makes many children lose interest. Also, if you get one for your child, you must understand that they are ultimately your responsibility to ensure they get fed, watered and cleaned. If you are going to rehome it because your child "loses interest," please do not buy a pet for your child until they are old enough and responsible enough to care for them regularly.
If you want a better pet for a younger child, I'd recommend a rabbit (which I also breed), as long as the child is calm enough to sit still and hold it.
Do they bite? Yep, they can! I work hard to make sure that they are properly socialized from a young age so that when they go home, they should be well-adjusted quickly. But, being prey animals, they will bite if they feel threatened. Apart from cute-ing us to death, biting is the only defense they have against potential predators. You need to take it slow and get them use to your hand inside the cage before you try to get them out. When you do go to get them out, you should scoop them out with their hiding house or a tissue box because they are going to be protective of their space, but are usually ok once they're out.
Crittertrail cages are so cute! Are they good cages for them? Heck no! They’re much too small and easy to escape out of. Also, the wheel is too small. I recommend a 10” wheel for mice. Aquariums or totes with 1/4” wire added to lids are perfect.
Do mice need friends? Male mice are solitary unless they’re in a breeding colony with females. No two males should be put together. Females do best in trios or larger groupings.