Perhaps I call H and talk to him about it? At least then if H says he prefers I not go I haven't presumed anything and I can tell my FIL and the kids that H feels that way.Cas
H didn't invite you. Why give him the power? Re-read all the responses you've gotten, make your decision, tell your FIL & then inform H. Inform H before FIL first, if you must, but if your decision is to go inform him of this unchangeable decision. Do not be swayed by H. Do it for MIL and FIL. Everyone else will survive one way or the other. imho.
Gardener
"My soul, be satisfied with flowers, With fruit, with weeds even; but gather them In the one garden you may call your own." Cyrano deBergerac