I've been under the impression that Raw milk and Pasteurized milk both have their advantages and disadvantages.
On the Raw milks side there's better flavor, and the fact that certain bacteria and lactic acid in it are good for your guts (which are also very good for your immune system). Going against raw milk is...a chance of nasty bugs ending up in it, which is a chance all food has if it's not handled properly in the first place.
Pasteurized milk is less likely to have one of those nasty bugs (although pasteurized milk still has the ability to make people sick). It is nutritionally inferior to raw milk because the heating kind of wonks up the proteins and stuff, and it doesn't have any of those bacteria that your gut likes to have.
I'd suggest you find out how the cows are taken care of and fed and how the milk itself is handled, from some of the poking around I did a lot that is very important, cause it can make the difference between safe milk and milk that might not might not be. If their cows are eating something other than grass it's probably better to not drink their milk.
Honestly though, I think you're mom is a little nutty, but you seem to be a little overly
paranoid about the whole thing too.
I wouldn't be so confident about buying directly from a farm when they obviously aren't following the health regulations and are forced to label their milk as being for 'pets'.
Duh, It's illegal to sell raw milk in America that doesn't automatically mean to have zero confidence in it.
Also, whoever mentioned vegan, I wouldn't push it so hard on people, considering vegans and vegitarians generally aren't seen as any healthier than their meat eating peers. There are also a lot of bodily requirements that eating vegan does not meet, meaning one needs to take a lot of supplements daily if they want to stay in good health. This is especially important in young children if you raise a child vegan or vegetarian take extremely special care they get everything they need
. There is no "healthiest" diet because everyone's body requirements are different, a vegan only diet might be good for one person, and terrible for someone else simply because their bodily needs are different.