If Jocke gives half of his fortune to Marie, than in case of a sudden demise, his elder sons will inherit only part of their fathers half. Marie's assets will not be affected.
whell we have three options with this scenario:
1/ Maree lives in the 1/2 that she's been willed to...so like she can't use the other half of the house because N& F own the other half
2/she buys out N&F out of their 1/2 to have one full house.
3/ she forces their half, and her half to be sold so she could buy one whole house.
4/ of course the Slow Danes could just pay for another whole house for her + children.