Hi, @amyjom. I hope that your mother tolerates treatment well, and that the entire family does well during this stressful time.

Some ideas about dealing with nausea, and about diet:
— My Rx were generic Zofran and generic Phenergan, alternated. Other people have mentioned Compazine and olanzapine.
— Having a little something in my stomach 1st thing, and throughout the day, often helped: two bites of plain white bread, saltines, or matzoh.
— Eating a bite of candied ginger helped, as did sucking on a wintergreen-flavored Lifesaver.
— Ensure Clear is like juice with added protein; I find it too sweet, so I dilute it. I preferred the apple flavor, which is hard to find (CVS and Walgreens sell the mixed-fruit variety, which I haven't tried). Adding water reduces the amt of protein per serving, of course, but for me they're just too sweet.
— The protein shake I prefer is made by Bolthouse Farms (in the refrig. section of my grocery store); it has fewer lab chemicals than Ensure et al., and I feel strongly that lab chemicals make us sick / keep us sick. I find these too sweet, too, so I dilute them with dairy milk, soy milk, or both (soy milk has a little less protein per ounce than does dairy milk; pre-illness I avoided dairy, but my diet has changed since diagnosis, in part bc my tastebuds have changed and in part bc I'm eager to get protein from anything that appeals to me).
— The dietician at my cancer center recommended that I boost my protein intake by adding powdered milk whenever possible (to mashed potatoes, to my protein shakes, to anything with a compatible flavor).
-- I craved mild foods, mostly starchy: mashed potatoes, pasta with a little butter, toasted white bread with a little butter, mild cheeses, grilled-cheese sandwiches, scrambled eggs, roast chicken (with minimal seasoning), sliced deli turkey, roasted sweet potatoes, grits (sometimes with corn, peas, and carrots), and occasionally mild lasagna. It might help to make batches of these things and divide them into single-portion stackable freezer containers (my supermarket sells own-brand rectangular stacking containers that hold 9 ounces -- they're perfect for me). If your mother doesn't want these foods now, she might want them when chemo ends and her appetite increases but she's not up to cooking. Or your father might want them now, given that he's probably not going to feel like cooking.