This year I flat out ignored father's day. I'm a woman, I might have the penis of a male but so what. That can be changed, it isn't a permanent thing.
Medical science likely can allow a male body to carry a fetus. Would that make a cis male a mother? Why not? The male wouldn't even need to be transgender. That would make a cis male a mother.
Frankly, if you create the life, carry the life and delivery the life, you are the mother.
This year I was mum on mother's day. My wife will always be our son's mother, and let's face it, even if she became male she would still have gone the route of carrying him and delivering him. Nothing can ever make her not his mother. But if she were to transition, she'd become a male bodied person that had gone through child birth.
I am a woman that has fathered a child. I will never be a mom as a result of that action, and nothing I do will ever change that. But hey, life is full of odd changes eh. Say my wife passes away, I transition and if I were to get married again and it wouldn't need to be either to a cis male or cis female or any of the many variables, I could still be a 'mom' to an adopted child, but, I reserve the right to be a mother to a person with the gear to do it, or the medical assistance to carry out a pregnancy. If you didn't carry the child for 9 months, you are not the mother.
Mom though, doesn't need to be equal to mother. Mum doesn't either.
I go by mum, but I suspect no one is listening to me around here. I'm still getting referred to as dad as well as son. It's irksome, but, I look too male still as well. I am planning to alter that though. I plan to have a proper female hairdo, and I plan to wear woman's attire, and THEN I will have little if any patience with people STILL calling me by male manners of address.
I'm not planning to wait till I have a vagina for people to get it correct eh.
There are many terms eh, but you get to decide which one applies. 'I' consider myself a mum. I am a woman after all.
I'm a sister, an aunt, a daughter, I am a mrs, and a miss and a she a her and a woman.
I was discussing things with a friend the other day. No I am not a transsexual anything. I am not a sexual anything. You can label whomever you what whatever you want, but, my status has nothing to do with who I like to have sex with. I am also not enterly interested in being called transgender and only use the term briefly to cut down on explanation times. I'm inclined to like the approach I have seen others use. I am a woman, I am female no hyphenated anything.
I am flat out not interested in getting permission to say what I am. I am not interested in waiting for the Canadian legal code to give me an official ruling. I am not obligated to agree with pieces of identification. They can write down anything they like, I reserve the final say.
I pick my fights though. My life won't end if I am forced to pee standing next to cis males in a men's washroom. Just so long as they can deal with the fact that when I am done, if I need to stand in front of the only available sink and spend 5 minutes freshening up in front of the mirror, sorry, I won't give a damn if you have to wait to wash your damned hands eh

I'd rather be in the ladies room getting in the way of other ladies waiting to fix up their makeup and not their husband hehe.
As I said, I am a mum, I celebrate my parenthood on Mother's day jointly with my wife. I am not stealing her thunder, nope, I am just not in need of waiting till June for 'my' day. May is OUR day.
My son is 19 now, and I of course don't need to fret over a range of stuff that others will still be coping with.
Some day I will with luck get to be a grandmum. There is no grandfather in my future though.
Anyone refusing to acknowledge me as 'mum' likely will be merely ignored too. I'm not required to play along eh. None of us are.