What a wonderful topic. Yes, I think some of them I absolutely idealize. My gg grandmother Sarah Scott Hayes (who I have written about before) I definitely have rosey pictures of her, but she grew up illegitimate with some family that apparently had a very loose connection to her, possibly their SIL's bastard daughter. She crossed an ocean and married by the time she was 19. She died at 24, with two daughters, and possibly 2 more children who I can't trace. I like to think her husband (my gg granddad) loved her beyond limits. He lived until 1943 (she died in 1888) and he never remarried. But who really knows. I never will.
The opposite of iealising someone is a great-grandmother of mine. My mom didn't know her too well because her dad left when she was about 2. Her grandmother tried to have a relationship with her, as much as my bitter grandmother would let her. but my great-granny was very much into appearances, buying expensive, nonsensical presents for her grandchildren, pushing my mom to be a debutante (I kid you not) and all those grandiose things. I have, in my research, found cousins who remember her and say she was quite a ... hard character, preachy Catholic in a Lutheran world, hard, very much above her "station" and bitter.
But I read a "fiction" short story she wrote in the 50s and let me tell you, I think life was really hard for her on an emotional lvel and to make a long story intriguing, my uncle wasn't her biological grandchild, she knew it and tried to love him anyway, so maybe she tried her best.
And maybe that is the message of then and NOW: we aren't perfect, but we do our best.
Kath