If it wasn't for this war, the two families without core conflicts of interest could have supported each other and moved forward together, becoming a tale to tell within their circle.
Unfortunately, the situation changed too fast, and even though Hudson had already lent a hand to the nobles of the Seven Northern Provinces, the Hollis family was still severely weakened in the war.
Heavy losses did not affect the existence of the Alliance, but the balance of power between the two sides was disrupted. The original mutual support turned into a one-sided output.
In the short term, it wouldn't affect their relationship, but eventually, obligations would run their course.
After a generation, if the Hollis family hadn't recovered, they would be left with just familial relations.
Wise people use favors at critical moments, not deplete them constantly.