First of all - I am sorry for your loss and wish you best for luck in the future. Losing one beloved person is hard enough but losing both of your parent in such a short amount of time must be especially difficult to handle. Hopefully you have caring people around you and get a lot of (professional) support.
But even if it may sounds rude to bring it up now: We all have our crosses to bear. That does not mean in any way that your feelings are less worth or invalid but rather a friendly reminder that not only you suffer. League of Legends has an incredibly huge playerbase with different kind of people - and probably also with a lot of sad stories behind it. You would like to be treated with enough respect and enjoying your game peacefully, wouldn't you? Then consider that your behaviour could possibly also ruined the game for your (not insulting) teammate(s). Maybe they wanted to play a chill game after dealing with a lot of shit in life, maybe they were just dudes trying to have fun - you can't know.
Riot doesn't know you - they may have a lot of private information about your person but besides that - nothing. When the automatic system reviews your chatlog - well, for it you are just player "GimmiMoar" who broke this or that rule. Riot doesn't approve the behaviour you had to face but they don't allow counter_flame_ (unsure if you really flamed due to pending chatlogs),
We can not allow to give player free-passes just because they deal with a tough situation. Some people could lie, abusing this system - making up wild stories to get sympathy and others could cross the line massively due to their uncontrolled frustrations. God, there are many possibilities how this new "rule" could lead to chaos.
League of Legends is well-known for its toxic community, therefore I would highly suggest that you start muting teammates as soon as they start showing negative signs or even at the beginning of the game till you are coming to term with the deaths.
