Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993.
indulgent (adj.)
can combine with several prepositions: in, as in He is too indulgent in disciplinary matters; of, as in They are too indulgent of her crotchets; to, as in He seems indulgent to [toward] all their foibles; and with, as in We try not to be too indulgent with the children.