are we allowed to transfer our money in hyperwallet to someone else's PayPal account, or it has to be only our own PayPal?

have you tried it yourself?

I previously used Payoneer under different name, thus I guess it will be possible to use Paypal too. But you have to write to Hyperwallet support.

cause Hyperwallet is owned by PayPal, and we all know their terms of service are quite strict. so trying this might result in my account being banned or deactivated.

You're probably right. I'm assuming that you want to do this to transfer funds to another family member and avoid potential tax implications, otherwise you would just transfer the money to another person via PayPal account to PayPal account. Most countries have tax treaties with one another and are trying to find ways of taxing money made online and also track potential money laundering activities. Perhaps simply asking Hyperwallet to see if you can do this, might red-flag your account for further investigation.

I've already submitted an email to Hyperwallet support team inquiring mentioned subject, however haven't received any reply yet. and also non of your presumes are the case, the main reason is i ought to lend some money to someone whose PayPal account is from USA while my own is from UK; so I don't wanna double pay for PayPal exchange rate.

Well, obviously my presumes are wrong now that you explained it.