Upon visiting a long time friend’s house and you see no kids wandering around, you’ll still be able to recognize that there are kids living there.
Writings on walls, doors and floors
Empty containers of milk
Teddy bears and stuffed toys in bed
Messed room with toys
Milk and diaper grocery items
Baby hammock or crib or walker
Pictures of things on the bedroom wall
Small belongings like cute slippers, bags, etc.
Moms, aside from pictures of the kids, if you have some other signs seen, please free to comment and I’ll add them up.