No, sorry. Mother of the groom isn't the bridal party - she's the groom (al?) party.
If i had a son i'd like to be with him the morning of his wedding, fussing over his suit ect.
@Laiste Do you think it’s likely the groom’s party would have a hairdresser and make up artist, capable of doing a woman’s hair?
There is no way on earth, my DS would have let me fuss over him, getting dressed!
However, DDIL told me, she would get a hairdresser and make up artist to do her, her bridesmaid, me and DDs, if we were willing to share the cost, to make it worth while their coming. They also did DS’s aunt.
IMO, it’s downright mean to say the bride, her DM and bridesmaids can look professionally made up; but MIL can’t! As pp have said, the bride is marrying into DH’s family.
We treat DDIL and DSIL, like our own children. My MIL treated me as part of their family.