Hi, I am a cat behavior. What you should had done in a the beginning was to confine the cat to the bathroom or a room with no place for them to hide. Why? this way, they can get to know you, the place where they are now...
This is so important, for you are now the new parents.
If you can get them into a room, it will still help.. this way you can have their food, water, litter and a box with or a chair and a towel for them to hide. In time you can start talking to them, brushing them and giving them treats.
If you can not get them into a room, hang in there...
Move the food to the room and a box or the chair for them to semi-hide.
Right now you have to continue to talk to them without touching. Reach out your hand daily in a distance for them to slowly move into to smell you and anyone in the family, instead of you reaching for them. Do not look at them eye to eye, just soft talk and treats...
Get a string toys, or feather toys, take time to play with them. It will ease them a lot!
It will take you at least one week, several hours a day to play. You can teach your kid to be in your side, so they start smelling him as part of the family and not fear him. Be time to teach you kid how to touch him.
Take time is crucial...
Hope this help