Yes that's correct. The filial spirits rely on making connections with them, rather than any written s-spells or spoken incantations. They're more, emotionally and psychically bound to p-people. I think, actually, being a skilled user in your world would make it infinitely easier, actually.

[ Helios listens as the other speaks. A soft 'hm' escaping him. ] But, well, learning your own spells is probably the best first step. I-I definitely have no problems helping you. Wh-what about them is, ah, g-giving you trouble? [ Since he seemingly can use them already. Perhaps it's simply reading the symbols or memorizing the incantations? ]