maternize
/ˈmatənʌɪz/(also maternise) rare
verb
[with object] To mother (a person); to be as a mother to; to endow (something) with motherly qualities.
Origin
Late 19th century; earliest use found in ‘Rolf Boldrewood’ (1826–1915), novelist (real name Thomas Browne). From matern- + -ize.