兒孫自有兒孫福

younger generations will do all right on their own (idiom)

child / son

non-syllabic diminutive suffix / retroflex final

descendant

surname Sun

grandson / descendant

self / oneself / from / since / naturally / surely

to possess / to own / to have

(I, they etc) of course have (a plan, a way etc) / one's own (apartment, brand etc)

to have; there is / (bound form) having; with; -ful; -ed; -al (as in 有意[you3 yi4] intentional)

surname Fu / abbr. for Fujian province 福建省[Fu2 jian4 sheng3]

good fortune / happiness / luck