His son Richard went to California as best we can tell. Likely around 1890. He married a Sarah Jane Heck December 28, 1882 in Oxford County. Richard was listed as living in London, ON at time of marriage.
All others seem to have stayed in Canada. However, other branches of my tree were in Michigan , usually for railroad work.
Richard Weir- obit 1932
https://www.newspapers.com/clip/9152463/the_san_bernardino_county_sun/======
Wife Sarah
The San Bernardino County Sun
San Bernardino, California
Thursday, May 27, 1937 - Page 13
Mrs. Sarah Jane Weir, member of a prominent San Bernardino family, died in a local hospital yesterday, succumbing to a broken hip received a month ago in a fall. She was the widow of Richard Weir, building contractor for many years in San Bernardino, who died in 1932. Mrs. Weir was 80 years of age and a native of Canada. She had resided in California and in San Bernardino 50 years, her home being at 1353 Birch street. Surviving are one daughter, Edna Weir; two sons, H. H. Weir and J. W. Weir; four grandchildren and one great grandchild. Funeral arrangements are pending, with Stephens & Bobbitt Co
=====
Leave for Visit Home- 1924.
The San Bernardino County Sun
San Bernardino, California
Sunday, August 17, 1924 - Page 7
Richard Weirs Leave for Canadian Trip-
Mr. and Mrs. Richard Weir will leave today for a vacation trip that holds the promise of being most delightful. They are going to their old home at London, Ontario. It has been nearly 35 years since they left the city of their birth for California, and there are many relatives and old-time friends to see. They will leave over the Santa Fe at 10:50 o'clock this morning. At Detroit they will be met by William Phenlx, a relative. and after visiting in that city will cross the international boundary line into Canada for their pleasant visit at the old home. They will return the latter part of October.
=============
Returned from Visit 1924- Lots of good info in article
The San Bernardino County Sun (see Attached clippings)
San Bernardino, California
Tuesday, November 04, 1924 - Page 8