both my parents always bentched us on friday night. i’m not sure if they took the minhag from my yeki grandparents (mother’s side). however, my grandparents bentch their children & grandchildren 3 times -on friday night, shabbos day, and on motzei shabbos.
my husbands family kisses their mothers hand on friday nights (chassidish background).
i don’t know where all these minhagim come from, but they are all beautiful!