“a dit Maman d'un ton admiratif en le voyant”
This seems such a strangely constructed sentence! Can anyone break it down?
(i) “admiratif” is an adjective (I think) but the possessive “ton” treats it like a noun.
(ii) “voyant” seems to be used as a present participle here (“the seeing”), but I’ve only seen these preceded by “en” before.