My mother was a big bra-burning feminist who somehow got it into her head that breastfeeding would rob her of her freedom, so she fought it with everything she had. It didn't help that back then, the hospital nurses would openly look down on anyone who didn't nurse. Just to go against the grain, my mother chose formula. Finally, she had inverted nipples and was told she'd need to wear a shield, so that scealed my fate. I was bottlefed soy formula.
To be quite honest, my mother has supported my *choice* to breastfeed, but she still thinks it's a "whole bunch of troubles" (directly translated from québécois French!). I'm a very stubborn person though, so I just ignored her and kept doing what I wanted. I don't know why exactly, but DD only took a bottle ONCE at 8 weeks, and then never again. My mother equates that with a loss of freedom for me, and she sometimes talks about how I am sacrificing myself on the "alter of breastfeeding". I know she looks forward to the day that I wean. My father, on the other hand, was nursed for quite some time, by a wet nurse, as was the tradition in wealthy families in Viet-Nam. My grandmother was a midwife who ran a midwifery hospital in Saigon, so he was quite comfortable with the idea of extended nursing. Just the other day, he talked about the wonderful gift I have given my DD by nursing her for this amount of time. He still considers it a sacrifice on my part (because of the lack of sleep and the inability to pass DD off to DH for a bottle), but I think he feels it's a positive sacrifice. My mother, sadly, does not.
My DH was breastfed though I have no idea how long. MIL was an L&D nurse for decades and she firmly believed in the benefits of nursing. I think I got more support from my MIL, the lactation consultants I saw and the Nourri-Source group I attended, than from my own mother.