Simplify the following text for a Grade 8 native English-speaking person.
Original: Both Evelina and the Reverend are unhappy to hear Mme Duval 's wish to sue Sir John Belmont .
Simplified: Spurred by Evelina 's greedy cousins , Mme . Duval concocts a plan to sue Sir John Belmont , Evelina 's father , and force him to recognize his daughter 's claim in court .