Cats are creatures of habit, so it is important to establish a routine from the beginning. This includes regular times for eating, playing and using the litter pan. A predictable routine will help your cat feel secure and confident.
^^ this is good advice! I actually think it is easier to raise sibling cats rather than solo/sola cats because they can learn their routines together.
Yes, it is even more beneficial for both as they can play and have physical activity with each other.