Siblings not invited to the wedding?
DH and I have 2 bios, DD8 and DD11. He also has 3 kids from his former marriage, SD31, SD29 and SS26. I have been in their lives for over 15 years. SS26 and SD29 are both getting married this year, SD in July and SS in October. We received an invitation in the mail for SD's wedding this weekend and it was addressed to Mr & Mrs Zipper. No mention of our DDs. I have worked very hard and put up with some not so friendly treatment to form a cordial relationship with them. DH and I have also tried to make sure the stepkids and our kids had plenty of opportunity to know each other even with the age difference.
I knew our DD's were not going to be in the wedding (SD's wedding website has been up for months and has pictures and bios of her bridal party) but it never crossed my mind that they would not be invited. DH suggested that maybe it was a no-kids wedding but I told him to look at her website, the 2 flower girls and ring bearer and the grooms nieces are kids. SD29 has 2 godchildren who I'm sure will be at the wedding. We haven't told our girls yet. Their feelings are going to get hurt. DD10 has been following all of the wedding planning on instagram and DH's facebook and asking me when we are going to get dresses.
DH thinks we should call SD and make sure they are not invited and if not, ask for them to be invited. That seems rude to me. Has anyone been through this before? Any advice?