そふ
grandfather (my own)
sofu
JMdict 1396840
そふは祖父はgrandfatherつよい強いstrong
は (topic) lifts 祖父そふ (grandfather) up as the topic — “as for grandpa…” — and the rest comments on him. 強いつよい (strong) is an i-adjective standing on its own at the end; no copula is needed because the adjective already does the work of “is.”