You see, THIS is one sided! I was a nurse in a Pediatric Urology Clinic. Boys do get UTI's! Some boys gets lots and lots of them! Yes, poor hygiene could be the cause, but so could a 1000 other things. There is absolutely no way of being dead certain that poor hygiene was the problem behind ONE UTI. I don't care WHO told you that either. Maybe he got it from a dirty toilet seat
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Do you have children of your own? I wonder how you would feel about having somebody else (or somebody else's entire family) looking over your shoulder and judging, critiquing, and pointing out every mistake you make, as a young, new parent?
Just Ld said, you and your family have spent so much time and energy "protecting" your brother's estate that you have truly sight of the big picture. Which I hope is having a relationship with these children. Go ahead, drag it out for another 5 years. But don't forget that the court records from this estate battle will also be "public record" that the kids will one day have access to. Are you positive that they will judge this as you and your family doing "the noble thing" by protecting THEIR father's estate from THEIR mother? Or could they possibly view it as your family picking the money over them?