Bræin immigrant(s) to U.S.

My grandfather's brother, Matthias Olsen Bræin, emigrated to the U.S. (date unknown). He lived and died in Minneapolis (d. 21 Jan 1923) and had a grocery store "Mat O Brain & Son". I don't know who his son or wife were. Also two other family members (nephews?) Sigurd & Christian came over in 1911 and 1901 respectively. I don't know if they ever left again. They were all from Faaberg. Their names show up on Ellis Island as "Brain". When Matthias died in 1923 he was Mathews O. Brain (just goes to show how names change!). Anyway I'm looking for any descendants, although my uncle in Norway says there weren't any. Anybody in Minnesota know of this family? Thanks!