QUES:
Who is they in the following sentence?

Parents send their children to bed, and they have to listen to authority since they are dependents.

ANS:
their children

QUES:
Who is they in the following sentence?

The heavy weapons team bombarded the settlement with their mortars since they needed to soften up the enemy before moving in.

ANS:
The heavy weapons team

QUES:
Who is him in the following sentence?

Hitler conquered Alex in the war because nobody supported him.

ANS:
Alex