It is wrong for parents to disuade their son/daughter from marrying someone because of wealth, yichus etc. If a child is dating someone that they feel is suitable for them in terms of hashkafos and personality the child should be able to make the decision. The child is the one that will be living with his/her spouse in the future. If a parent wants to make sure that their child marries someone that is “good enough for them” (or the family is good enough for them), they should do their research before things get serious!!!!