Use Of The Definite Article "the" And The Preposition "in"

Hello to everybody! How are you? Can I omit the definite article in this sentence?: "THE children wake me up everyday". I suppose not because "children" here are not all the children in the world. I am not talking about children in general. Right?

Imagine I am outside the house and go in because I wanna play. Should I use the preposition "In" in this sentence?
"I Want to play "IN""


Cheers!

Jesús

Isn't it be possible to use "children" without 'the' here?

If you don't tell definite children, I think it could be possible.

For the second question, how about using "inside" instead of just "in"?

I prefer to say "I want to play inside(my house).


I'm not quite sure, so plz correct me! :)

1 Use 'the' because it's a specific group- yours, presumably.
2 I'd say 'I want to play inside/indoors'
;-)