Shammy
In my humble opinion you need to set some boundaries and make them very clear to this son of yours.
The main one should be that you will continue to pick up and deliver your granddaughter, however, if you have even the slightest sense that he is not sober, or smells of alcohol, or acts as if he has even had one, that you will NOT LEAVE THE CHILD WITH HIM and he will not be accepted in your home.
The only problem with setting boundaries of any kind is you must be willing to stand by them. To "Say what you mean, and Mean what you say."
Only you can decide what behavior of his will be allowed in your presence or in your home.
Please feel free to contact me any time thru private message and I will give you my email address.
I don't always have the answers, lmao, but certainly have broad shoulders and can be a "venting board" for you.
Love and (((((to all))))) to all,