That’s definitely a bad idea to invite them to tea:

1. They know you saw them
2. They’ve got permission to enter you house
3. You are giving them food!!

It sound like a recipe to get your daughter stolen from you, or to have your house falling down on your head, or losing your mind or straight being skinned you and your family.

Carefully go back so they don’t know you saw them.
Do not ever speak to this to anyone, not to your parent, your neighbour, your child not to your SO, not on the internet or your diary and lets hope you don’t speak in your dream.