My daughter is getting married in her fiances and in-laws church, we the parents are from different religion,?

and they want to get married there because his parents got married there. This church is charging $700.00 including the officiant fee. We are paying for venue, flowers, music, food, decor. In our religion we are only requiered a $100 donation to the curch. Should we also pay for the church or the groom's family as is their church and religion?