Should I invite my ex stepmother to my wedding?

Being that she is an ex-stepmother and that you don't seem to get along with her, I would say that an invitation is unnecessary. This is especially the case if her presence at the wedding will cause drama (for your father, your siblings or for you). Even if your siblings are quite young, their father will be there (as will his side of the family) so there will be plenty of people to look after them.

people involved in decision,

fiance----his opinion is the only one that matters

dad---our of courtesy, you and fiance talk to Dad (if he is still how do I say, with us)

syblings------she is their Mother, so it would be for them only, don't know ages, but some must be older as they are in wedding in some way

Back to first opinion when I read first time, No--easy you say two words or a word and a half ex and hell, that adds up to no invitation.

Talk to your father about this.

If you are inviting because of your sibling, see what your dad thinks. He will be there, only one parent need to be there.

It's fine not to invite her.

It should be something your father and you should talk about and decide on, not strangers on the internet that never met anyone involved

Unless it will cause some problems between you and your siblings or they may be offended if she isn't, I don't really see a reason to invite her.

If your siblings are small/young and may need help getting ready that may be the difference.

If you're not on good terms with her even if you do invite her unless its out of spite, she's likely to RSVP no anyway.

I dont see why you have to, she is not related by marriage or blood and you dont like her. Its your wedding after all and you cant invite everyone you've ever known. invite those you really want to be there,its a very personal time for you, you only want those who will share your joy involoved.

. here's a tip-no matter how many people you invite, there will always be someone getting those nose out of joint cos they didnt get an invite.

Well it really depends I personally wouldn't (it's totally up to you ) your wedding should be the most exciting day of your life full of Joy and excitement .. It's your special day And you only want to be surrounded by important people "No Negativity"

You don't want any awkward tension on your wedding day, your dad and siblings come first. Wether or not she's there IMO is of no importance..

Have a great wedding

Goodluck

Yes, absolutely. Be the better person. Don't let her nonsense activities drag you down to her level. ;-]

What kind of problems has the step mom caused? See it all depends on that n if there will be liquor there. If she's the type that is surrounded by drama n people fighting n yelling then no.thats wonderful if you have a relationship with your siblings you don't have to extend your self when it comes to their mom.

nooooooooooooooooooooooooooooooooooooooo ... this is NOT the day to be the "better person" ... this is the day to "BE YOU!!" ... it's YOUR WEDDING day ... I wouldn't invite her

INVITE HER AND RKO THE ***** THROUGH A TABLE. VINTAGE ORTON, VIPER OUT OF NOWHERE