"With all my worldly goods, I thee endow""
This is what it's about and how things pan out in later years, especially if property is involved, although it seems almost crude to bring it up.
Being a wee bit older, I can't tell you the ammount of divorced families, where fathers leave behind children, it hurts them, I've seen the dance of trying to keep their fathers connected to them, when really most of the time they want to give it to them with both barrels.
The fathers hide behind the new family and really don't try themselves, expecting estranged children to do the running.
Years later with frayed relationships the dad dies, leaves everthing to the second wife and then her kids inherit the lot.
It's horrible for children of absent fathers, the constant tightroping of, do I bother with him or not, because all his effort seems to be going to his new family.
You have my sympathy op.
There is so much more to this post than 'just' a present but the new wife is too stupid to accept or understand and your dad is not facing up to the reality of the situation.
Communication is the key but too many men wish to sweep their responsibilities under the carpet.
It all becomes a bit fake.