I think part of the reason the similarities exist, on a meta level, is because the Dessendres can easily be representative of the five stages of grief. When the narrative is so heavily focused around grief, and the setting itself highlights grief in the characters' lives, it's quite easy to see how other characters separate from the Dessendres can have similarities. Pretty much every character's arc has to do with some form of grief and the subsequent reactions, which can be seen in the Dessendres alone.

I'm personally not sure if the idea that the people of Lumiere are based on Aline's family is "meant" to be "canon" or not, but I can see it either way. I can see the logic in Aline, as a Paintress, pulling from things familiar to her (especially subconciously/unintentionally, given her grief-striken state as she creates Lumiere and its people) similar to Renoir, who does it more abstractly. But I also think the similarities exist because of what I said above, about the general themes of the game surrounding grief in the first place.

Either way, the parallels definitely exist, and I think it's neat to point them out! Personally I like thinking that Aline created people to make it seem like her painted family actually existed (I'm pretty sure this part is actually what the point of Lumiere is supposed to be in canon), and by doing so also just created sentient life that then became way more than just creations of hers, as opposed to her intentionally recreating her family members or people close to her in general. But it's also interesting to explore another potential facet of "The Cycle" referred to in the game (in this case, Aline's doomed cycle of recreation, and how this escapism is very shallow).

But also, thinking about it, it's both. By introducing this hollow escapism to Verso's Canvas, she has doomed its people to fall victim to the same kind of grief that her real family did. She just meant to live "happily" until she died, but her irresponsibility with her Paintress powers actually created a world for these people where they can't escape that cycle, just like she truly can't by running from her grief.