All the illustrations I have seen of the exception from the GROB rules relating to a donor giving an undivided share of his house to a donee, who then shares the house with him, refer specifically to a half. This makes sense, I guess, as the donee's use of the donor's half is fair consideration for the donor's use of the donee's half.
Has anyway had any success in establishing a gift by the donor of more than half?
Many thanks in advance.