Me [30F] with my husband [31M] is convinced my father [60sM] is meddling with my ducks

My parents live a few hours away so it makes sense that when they visit they stay in the guest room, right? My husband and I have noticed (and find it very odd) that whenever my father is staying there is a duck issue (I foster injured ducklings/orphaned ducklings until they are well enough to be released/rehomed. Only wild ducks are released into the wild, I am not one of those people who just dump a duck off at a pond etc) but anyway, my mother has stayed alone and there have been no problems so that rules her out of the picture.
Whats been happening: About a year ago a duckling mysteriously managed to escape (keep in mind this had NEVER happened before) and he was the only one who knew about it. I wasn't suspicious, I caught the duckling again, checked its enclosure, I couldn't see a way it could have gotten out so I popped it back in. It didn't get out again.
Six months ago another duckling escaped while he was staying (keep in mind there had been no escapees since his last visit). It was the same situation, he was the one who found it running loose and when I put it back in there was no obvious way it could have gotten out. It didn't get out again.
He is always making negative comments about them, saying they are too 'loud' etc. We also clash a lot (our personalities are very different).
Anyway, the latest incident. The other night it was quite stormy, I had four decent sized ducklings outside for the night so I put them in their crate so they'd be safe. They were all perfectly fine the day before, no signs anything may be wrong. I let them out in the morning and one of them has died. I am seriously confused, it also looked like it had happened within the past hour or so. It had no blood on it either but another one had somehow had a piece taken out of its beak, it was bleeding. I was very upset and took the live ones inside to see what else I could find and to tend to its beak (which will be fine, thankfully). He was not surprised when he heard the news one had died, didn't say anything, only let out a loud sigh when I took the remaining three inside.
Keep in mind when he is not here there are NO problems at all with the ducks! Absolutely no issues. My husband has noticed this and he is convinced that my father is behind the issues, thinks he heard them chirping when the sun came up and shook the crate so wildly he killed one and how one got an injured beak (there was a small pottery cat bowl in there and he thinks that is how it was injured). I thought maybe they had gotten spooked by something (it was stormy) and it had gotten trampled, it was the second smallest though but perhaps a bigger one somehow stood on its neck causing it to suffocate? I have had them (and 50+ other ducks over the years) spend a night in there before and had no issues.
I asked my mother about it, doesn't she think it is odd etc and she said I was 'bringing up the past' when I mentioned how the ducklings escaped only when my father is here, never any other time. She was angry that my husband thinks he has something to do with the death of the duckling, said she didn't want a fight but became crazily defensive of him. and she became very upset, on the verge of tears. It was not a confrontational conversation, just a "Do you think he may have had something to do with it? We think he may have shaken the crate."
TL;DR: Husband thinks my father is endangering my ducks and caused one to be killed.
Edit: Will also add that when I was living at home he would run outside and chase them off the property, one time a small duckling became trapped in the property and before I could even do anything he had cornered it and threw it over the fence, the poor thing had tiny wings and would have landed quite hard.


Source.