Is it normal they all stopped speaking to me?

older brother not spoken to me for 5 months. I can't think of a valid reason, apart from he came to stay with me for a year-I live in diff country+ he wanted to give it a go before bringing his wife and daughter.We had a silly argument+ next thing he'd gone back without telling me. This happened about 2 mth after our Mum passed-Im devastated about my Mum - him not so much.I went home to visit other family+ saw him in a bar. I asked if we could talk - he wouldn't, I got a drink,+ when I got back- he'd gone. I was so hurt. A month later he had a heart attack, I was last to hear- his wife came to my Mums to tell me and she was getting upset. I said I was sorry to hear, as bro and I had been close previously and she asked me to do her a big favour. I thought she was gonna ask me to go see him, but, she asked me to keep out of his way, not drink where he does etc.for fear of upsetting him more. I was so angry-to me, this was making matters worse. When I got back, I had a comp tech guy come clean up my PC. He found e-mails on it from their daughter (17) to her mum, from when she stayed at mine for 6 weeks in 2008 when my Mum was staying. The emails were nasty, telling her mum her Nan was acting like a martyr and asking her to fetch things all the time (my Mum was 83) I was lazy, she had to look after herself and do everything for us! None of which is true- She doesnt lift a finger at home. Always has her nose in a book and at college.I gave her good holiday, I bought her things and took her everywhere. All the time she was being so nice to me + her Nan, so the e-mails came as a shock - + her mums reply was 'Dont worry baby, I can get you a flight straight away if it gets too much'! I never spoke about the e-mails but the niece was then suspected of sending anon F/book msgs to her brothers g/f, who she really hates. Her bro couldnt prove it was her, but the msgs were in her style. This was brushed under the carpet,+ she caused trouble again when she was out with her family-local yobs were calling her silly names cos of a hat she was wearing + because her mum dad n bro were there, she let her mouth go, acting tough, resulting in a big fight for my brother + him going to Court - but I know her mum told her off for this as she'd caused the fight, it was kept hushed from other family + friends of theirs, her mum thinks the sun shines out of her. Her dad doesn't know HALF how much her mother spoils her. Anyway NONE of them speak to me now+ I wanted to let the mother and niece KNOW I saw the e-mails on MY comp so sent them both a copy with the subject 'YOURS, I Believe' I feel that its so cheeky to send nasty emails about someone from their own computer. I need someone to clarify if this is normal family situation or am I missing something?