Have you looked into Lightroom CC, not the Classic version? It would provide you with a one place to store and edit, share your photos with your family. It can be setup to import your iPhone photos automatically too. Only thing is you’d have to pay for Adobe cloud storage depending on the plan you have chosen. You can have the Lightroom CC and 1 TB of storage for 9.99/month, or the photography plan which includes Lightroom Classic, Lightroom CC and Photoshop but only 20 GB for 9.99 or a Photography plan with 1TB for 19.99/month where you get both version of Lightroom and photoshop.
Using Lightroom CC enables you to store your RAW files in the cloud automatically, with Lightroom Classic CC you can only have the smart preview stored in the cloud. If you already pay for Lightroom photography plan, you can try Lightroom CC and see how it works with the 20 GB of space, try to share albums with family and get their feedback to see if they like it and if you want to migrate all your photos to that. It’s a great solution for people with both DSLR and iPhone or android phones.
Here’s a tutorial on how to share an album in LR CC.