We talked with the pastor of the church where we are getting married and discussed the different participants we would need for our nuptial mass (readers, gift bearers, etc).  He mentioned that we would also need 3 eucharistic ministers (in addition to the priest) to distribute communion.  
Quite honestly, I don't think we have 3 trained eucharistic ministers among our intended guests.  Would it be appropriate to ask family members to be trained as eucharistic ministers for our wedding or should we talk to the church and see if they would be able to supply some of the ministers?