They should try A2 milk. It s all A2 protein like goats milk.
Technically, goat contains small amounts of A1, but overall it is far more digestable, more nutritious, and more alkaline, without homogenization (which is not harmless).
I have been able to get fresh, raw goat’s milk where I live.
I react strongly to A1, so even goat affects me a bit, but it’s many benefits have overshadowed that one negative.