Hi Geoff, Don't know what you mean by "family details", but by 1920 the family has split up. Maggie Youngberg has remarried to a William Wilson and lives in Spokane, Spokane county Washington. Rounding out the household are MARGARETE Wilson's daughters, Bessie, Maud and Ruth Youngberg.
Earl Youngberg is single in 1920 & 1930 Park county, Montana Indexed on Ancestry in 1920 as Youngberg and 1930 as YOUNGSBERG. Also, on our social security death index is an Earl Youngberg who died in an unknown co. in Montana in Sept of 1962. Probably him. Dick