am I wrong?

my kids dad is an otr truck driver. we didn’t want the kids in daycare so his mom watches them while I work and go to school. they are NOT morning people. but I decided to give it a shot. it was good up until a few months one morning they didn’t answer the phone.. his sister normally opens the door or answers every morning I call before I drop them to make sure they are up and i’m not late to work. well one morning I feel like they ignored me I called the sister and the mom multiple times and the sisters phone was on do not disturb so she was not getting ANY of my calls or texts which she normally doesn’t have me on DND. their dad called and no one answered. I literally left and as soon as I got to work which I was an hour late AND ON THE VERGE OF LOSING MY JOB! they texted back. sister told me mom was downstairs on the couch and she thought she would have answered the door. mom told me she was upstairs with her daughter and no one heard the door” somebody is lien!! so I put the kids in daycare bc I cannot afford to lose my job and provide for two kids plus my household. they are PISSED at me and trying to make it seem like i’m keeping the kids from them but I need reliable ppl to watch my kids do I want them in daycare? not necessarily but I can’t trust them. it was one time but one time is to many considering I almost lost my job. I don’t think i’m wrong but does anyone else see a problem in what I did? they are disrespecting me now and also my kids father doesn’t want to help financially bc “i’m not bringing the kids to his family house” which is ridiculous and i’m doing everything by myself no help.. I don’t trust them to watch my kids anymore bc this isn’t the first they never answer the door!! not for my job but for other occasions that I asked them to watch them