modermördare znamená v Angličtina

matricide [matricides]▼(person who kills their mother)
noun
[UK: ˈmæ.trɪ.saɪd] [US: ˈmæ.trɪ.saɪd]

parricide [parricides]▼(someone who kills a relative)
noun
[UK: ˈpæ.rɪ.saɪd] [US: ˈpæ.rɪ.saɪd]