Yes! It's time to get your boy neutered! He's more than ready.
If you've been lucky enough, that he hasn't started spraying yet, do it asap, or he will start spraying on things to mark his territory, and male cat spray is terrible smelling!
On him grabbing and biting now, there's a possibility, that the people you left him with, were playing inappropriately with him, using their hands as toys, etc...
So get him neutered before his hormones start really raging...
And have a toy he can 'Attack' close by, to give to him, when he goes for your hands or arms...
Also, in a loud voice, say "Owww", to let him know he's crossed the line with you!
Hopefully, others will have some suggestions and ideas for you!
"A Cat must have three different names:
An everyday family name; A particular name;
And the name but the Cat Himself Knows, and will never confess." T.S. Eliot
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