Ivanka is trump's daughter (not his wife).

The wife (Melania) was not a millionaire before marrying trump. She was an unknown model. She got a US green card based on that activity.

There are bad rumors (she is suing a blogger and a newspaper for that), probably false, that started in Slovenia, where she comes from, that the modeling job that she got in the US was in fact an escort job, for rich men.