Seva means to do something for someone else without expecting anything in return. It means to do without the desire of any reward in return. You should do whatever you can do, whether it is by contributing your time, or by donating your money, or just by speaking about positive things. You should do seva in whatever way you can. But it does not mean that you do seva by putting your family members in trouble, or making them uncomfortable and going against their wishes. You should balance both intelligently. Do your Seva and also manage your family well.