I need seating layout for wedding ceremony. Where do parents, brothers/sisters, grand parents, aunts/uncles and friends sit?

In a Christian wedding, the bride's family and friends are seated on the left side of the church facing the altar. The groom's family and friends will sit on the right side of the church. In a Jewish wedding, this is reversed. Also, all parents remain standing under the Huppah throughout the ceremony.

When bride's parents are divorced, but not remarried, if they are congenial, they might sit together in the left front row at Christian weddings. Otherwise the parent who raised you (and guest or spouse) sits in the left front pew and the other parent (and guest or spouse) sit in the third row on the left side. This is also an individual decision, depending on their relationships and preferences. For groom's parents, simply reverse the seating (using the right side). At Jewish ceremonies, women sit on the left and men on the right.

If one family has many more guests than the other, everyone may sit together without assigned sides of the church. This will even out the seating and fill up the church from the front to back.

Parents of both sides sit in the first or second pew on their respective sides (often times the first pew is left empty in case someone from the bridal party must sit down during the ceremony). Grandparents sit in the next pew on the outside (next to the isle). Siblings can also sit in the grandparents pew. You can reserve additional pews for other honored guests (like family of flower girl and ring bearer, etc.) The reserved pews can be marked with flowers, etc. or the ushers can just seat the guests behind the reserved pews.

Guests who arrive after the bride's mother has been seated should not be seated by the ushers. They may simply slip into an empty pew behind the other seated guests.