In texas, who or how many people can you have in a car with you, with a permit???

I got my permit, and my little sister wants to stir driving with me and my mother. Is it legal?
If so, Who else can i have surrounded by the car with me?
you call for one legal drive 18+ to have any minors with you
One licensed driver over the age of 18. Any number of other passengers near seat belts are legal. Unlimited family +1 friend.
The person surrounded by the front passenger seat must be 21 with at least 1 yr of driving experience. You may one and only have one other person under the age of 21 specifically not a family member in the motor with you. Your whole family can drive beside you though. So, unlimited family, plus 1 friend under 21.