Depressed little bro about our mom's death.., ..help please... Options

[Blue apple]

Hi..

well i've got two older brothers and a younger one, Hugh.He's 8 years old.
Our mum died when she gave birth to Hugh.. Everyone,as you can imagine was very sad at first.. then we got used to it and we had Hugh so it felt like mum left Hugh instead of her..I was 6 years old my brother Tommy was 10 and Ross(my oldest brother) was 12..

I love my brothers very much and they love me too..We all love very much Hugh and i feel so sorry he never had the chance to meet mum..
the thing is that yesterday, a kid from Hugh's class came to our house to play w/ Hugh..
Johny saw some photos of mum in the livin room and he started all these questions about our mum's death and all..Ross told him a bit so he would stop asking as it was getting very annoying and depressing but then Johnny started laughing and said some really stupid things like: "so you killed your mum" etc.. Tommy got very angry and took Johnny back to his home but when he came back he found Hugh crying and shouting and he was so angry that told him some things he shouldn't have said.. he was like "now shut up Hugh coz you know if it hadn't been you mum would still be here with us.SHUT UP!IT'S YOUR FAULT!"

And then Tommy started crying.. Hugh went to bed but since yesterday he doesn't speak at all. He's been very quiet and he spent the whole morning in his room without talking to us..i know he's been crying but he's locked the door..

Yesterday night i didn't know what to do..i was so confused that when i saw Tommy shouting and then crying and I hugged him and we slept on the couch..he was very upset..He is very depressed coz right after he said those horrible things to Hugh he regretted it and he cried even more..

i know he still misss mum very much..
I don't know what to do to help both my brothers.. Tommy tried to talk to Hugh but he doesn't wannna listen to us.. Plus our dad will come back in three weeks..

Sorry 4 this huge post but I need your help guys..
love
-Alyssa