l want to know how do l get to Brusio from Lugano lm staying in Lugano for a few days and l want to trace my family heritage that started in Brusio?
I would guess either by train - www.sbb.ch - or by postal bus. Too tired just now to google it - but "post bus schweiz" should do the trick. Also, maybe others will notice your post and have better advice.
It's a long way from Lugano. I guess it's only possible to do it in one day if you rent a car (the bus only runs once per day), but even then it's a very long trip. However if you have at least two days you can include the Bernina Express, in my opinion the most scenic train ride in Switzerland. We can help you to plan something like that, but would need more information about your programm and places you want to visit.