The best replacement for sisters is brothers.

The best alternatives to sisters are rated as following:
★★★★★  brothers
★★★★  nuns
★★★★  sisters
★★★  pierce
★★  manning brothers
★  pace sisters
★  olsen sisters
★  big brother
★  brothers wrestling
★  parenthood

Your alternative for sisters is not listed? Suggest!
Speaking about sisters, one probably shouldn't forget about misters.

Other search terms related to sisters and their ratings are:
★★★★★ misters
★ sisters
★ brothers
You have in mind a companion for sisters and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sisters in all years. Click on graph for more.
sisters
brothers
nuns