To build up his blood, make sure your dad is taking a high quality B complex vitamin supplement, and eating foods that are rich in B vitamins (most of these foods are also great cancer fighters.)
I have a series of articles on the B vitamins on my blog, plus a few recipe ideas - the articles list the best food sources of B vitamins.
http://motherearthtreasurechest.blogspot.com
(On the blog, enter vitamin B in the search box at the top of the page - that will bring up the B series articles.)
Two things that are especially helpful and are very easy to add to foods, especially smoothies or juice drinks, are deactivated powdered brewer's yeast, and powdered lecithin: 2 - 3 tsp brewer's yeast twice a day, and lecithin as directed on the label. Brewer's yeast can sometimes be bitter - that is why it is most often recommended to take it in a smoothie or juice drink.
You can get brewer's yeast at health food stores, at some grocery stores in the organic section, or online. I use Swanson Vitamins a lot - here is one of their brewer's yeast products - look at the product label and you can see just how nutritionally action-packed this supplement is.
http://www.swansonvitamins.com/SW329/ItemDetail?n=4294967190
Brewer's yeast and lecithin also both come in capsule form, if your dad would prefer to take them that way.
Sincerely,
Tre