"The 5-year-old's mother had brought the boys to the house to visit the home's owner. The 11 year-old is a sibling of the 5-year-old's mother". (Can you rewrite the sentence in simpler terms? I need help!)

http://www.lasvegassun.com/news/2011/sep/26/boy-11-fatally-shoots-5-year-old-gun-he-thought-wa/