As has been pointed out many times, the Bible doesn’t say: train up young people in the way they should go’ (Prov. 22:6), it says train up children. Evidently Timothy’s parents (and grandparents) knew the verse, for he had been taught the Scriptures from infancy. The introductory words on Timothy in the book of Acts (16:1) suggest that it may have been just his mum doing the teaching.