I did upgrade to Spotify Premium Family, although not without some ballache.
Mrs Hearthly was easy as she had an old Spotify account from years ago, so I just upgraded my account to Premium Family, sent her an invite, she got the email, clicked on the link, signed into her account, boom, job done.
Hearthly Jnr was the fun part as she had no existing account. So I signed her up for a new account, when you go to the Spotify homepage on the web you actually get this:
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This is down to shitty IOM IP ranges (the same issue that gimps the Google Play Store unless you VPN your device), but it did allow me to sign up for a new account for Jnr, but then located her in the US, so when I sent her the family invite it said she was in the wrong country, and then refused to let me change her country to the UK. (There are no options to choose your location when you sign up, it decides where you are. Premium Family states that the accounts are only for people who live at the same address, let alone in the same country.)
Oddly there was the option to change her country to the UK in the dropdown list (only USA and UK were listed) but the account page errored every time I tried to do it. According to the FAQ you should be able to change the country on a free account for up to 14 days, but it didn't work. On a Premium account you can change the country at will, but of course I couldn't get the account up to Premium because it wouldn't let her accept the family invite.....
In the end I couldn't find any way around it, so using one of my other email addresses I VPN-ed my Shield tablet with a UK IP, signed up for another Spotify account which was homed correctly in the UK, sent the Family invite to that, and then logged that account in on Jnr's PC and then she had a Premium Family account too.
It's not quite ideal because her account isn't now using her email address but one of mine, but that's no biggy really.
With that out of the way it does all work splendidly, and we now have three entirely independent Premium accounts for £14.99 per month. I've installed Spotify on every computer in the house so we can have music on wherever we are. I've already started putting together CHOPLEY'S AWESOME PLAYLIST which will have all the best music ever on it.