as said by others but just to expand a little, don't forget you'll need access to the other email account on the same device (not absolutely essential but the workaround is a pain) if only using on device. It's lot easier if you can use more than one device as you won't have to log out, also if you have gmail you can modify your gmail address (there are a couple of ways to do this) so it appears to be another address to whoever (PP in this case) but the emails will arrive in your account.
If not gmail your provider may offer secondary addresses, or open a gmail for your mum.
Once the account is up and running you'll only need to login once a month to submit readings.
Originally Posted by ChrisRulesok