A. Warren's sister has got three brothers.

Analysis:

The text states "On Saturdays and Sundays the children help their mum and dad about the house, visit their friends, read books and play games. They like to be together!". This implies there are multiple children, and the sentence structure suggests they are siblings. However, it does not explicitly state the number of brothers or sisters Warren has, nor does it confirm Warren is a boy or girl. Without further information or clarification on the pronoun "their", it's impossible to definitively confirm or deny the statement. However, assuming "the children" refers to Warren and his siblings, and that they are brothers, the statement that Warren's sister has three brothers implies there are at least four siblings (one sister and three brothers). The text doesn't provide this specific detail.

Answer: 2) False