I want my family to embrace Islam, but my brothers are atheist...?

Back off and mind your own business. Religion is a personal matter and a personal choice. Your family does not share your enthusiasm for Islam, and what you think they should do and what actually works for them are two different things. I hope you can have a civil discussion with them about it and learn to respect each others choices in life. Part of that respect is accepting the reality that not everyone wants or needs to follow religion.