Digression: Regarding your sister’s way of recording genealogy… you might want to tip her about the Obsidian Canvas Roots plugin, assuming it works on iOS.
With that setup she can write all her notes as plain text and later import everything into Gramps when she’s ready.
Obsidian is extremely easy to use right out of the box, and with the structure provided by that plugin she can start simple and record her data and “things and thangs” in plain text until she feels comfortable taking the step into Gramps.
She could even import the relevant parts of your own research as a “starter”, and the two of you could sync or share information later on. Just a suggestion for a lightweight, on‑the‑go workflow that might make things easier for her.
maybe banisterious can answer if his plugin will work on iOS or not?