...... well, of course, it's not unheard of for individuals APPEARING to develop the facial features of the people they live with over time ... often picking up their mannerisms as well.
Likewise, children who grow to resemble ADOPTIVE parents ... in spite of there being no biological connection(s).
Thirdly - albeit conversely - as you've indicated, Graham - siblings who share the same parentage ... yet whose physical (and frequently, behavioural) traits turn out to be completely UNALIKE!![]()