I don't think Lennier knew his family. He never mentions them. That would fit with being basically a baby on the doorstep of a Temple - and wouldn't contradict with extensive clan loyalty.
In medieval terms, a monastery was basically a group marriage. If you want to make an alliance between two chiefs, marry off their children. If you want to make an alliance between ten chiefs, take ten of their youngest sons and stick them in monestary. The monks would be tied both to their family and to each other, which would bind the families closer together. If Lennier was given by his family to the Temple, he would probably be expected to represent his family, and to speak for them, but his close emotional relationships would be with his peers (and mentors) from the Temple.
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In medieval terms, a monastery was basically a group marriage. If you want to make an alliance between two chiefs, marry off their children. If you want to make an alliance between ten chiefs, take ten of their youngest sons and stick them in monestary. The monks would be tied both to their family and to each other, which would bind the families closer together. If Lennier was given by his family to the Temple, he would probably be expected to represent his family, and to speak for them, but his close emotional relationships would be with his peers (and mentors) from the Temple.