I'm currently on maternity leave so money is tight due to one income. Myself and my husband discussed going on holiday this year but June July and August are out due to high prices and OHs work commitments. DS1 starts school in September so I looked at holidays over the October mid term and got a great deal so I booked it provisionally months ago after discussing it with OH. The holiday came up in conversation two weeks ago and OH goes what date is it again and I told him to which he goes I think that's the day I'm doing the marathon (which it is). I've now tried changing the dates/destination we go and it's working out approx £300 more which we can't afford. I don't understand why he didn't tell me the marathon was on when I discussed the holiday with him initially. There are a few runs and marathons he's doing this year and tbh I don't know the exact dates of them but he should have checked when I brought up booking the holiday for October.
AIBU?
Sorry just realised that it's only one child you'd take ot of school so it's £120 (we paid £240 for two of them)
Anyway, family holiday is much more important than his hobby, but my husband is similar, only difference he is into footbal 
The OPs only taking the older DC out of school for one day - that won't be anywhere near £120 in fines will it?
The DH must be a bit thick if he can't see that training for and entering several marathons doesn't count as doing something that he wants.
Also a shit husband and father if going on holiday with his family falls into the 'not something I want to do' category. 
I am old and cynical and spent 14 years married to a dickhead who preferred to have fun by himself rather than spend time with his children. I do hope he's still having fun... 
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