The amount of groomsmen for a wedding largely depends on the size of the wedding. For small weddings only a best man, who is the chief assistant to the groom at the wedding, may be needed. For larger weddings up to 10 or more groomsmen may be chosen.
This is strictly up to the groom. There is usually a Best Man and typically two to three groomsmen but this is just a usual number it can be as many or as little as you like.
The groom is not expected to pay for the tuxedo rental of his groomsmen according to customary wedding etiquette, although he could offer it as a favor or gift. You can find more wedding etiquette advice at WeddingWire.com. In general it is considered customary for the groom to at least cover a portion of each tuxedo rental, however this is not a requirement. In very large or lavish wedding cerremonies members of the wedding party often will receive a discount on their rented clothing if they all shop at one store. In these cases the groom typically will cover most of the rental cost.
It is customary for the Groom to give his Best Man and all his groomsmen gifts. For your Best Man, something a bit more expensive and personal . If you have more groomsmen, something simple like an engraveable money clip is fine. And if you are having a formal wedding with a rehearsal dinner, the Groom's parents or yourself generally pay for that .
The groom chooses his best man and the bride and groom can choose the ushers.
Basically, the groomsmen are the "assistant best men". They are up at the front with the wedding party, and have a corresponding bridesmaid partner. Ushers "work the aisles" in the church - they seat the people in the main body of the church. They do not have a corresponding female partner, at least as their function as ushers goes.
Right behind the groom and just in front of all the groomsmen.
groomsmen
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Let your pocket and your feeligs for the groom be your guide.
They're bridesmaids and groomsmen.
* It is traditional that the groom choose his Best Man which is a good friend or even perhaps one of his own brothers. It is fine if you choose to have your two brothers as ushers and this way they will be in many of the wedding pictures. Be sure to have a picture taken of just you and your brothers together and then you, your new husband and your brothers, etc.