[Edit: fixed link]
I had to look up what a SAFE was; had not seen it before. Here's a slightly out of date article from the WSJ
Anyway, Lane & Brian are both right: you can't protect any class of investors more than any others, BUT professional investors will include plenty of ways to protect themselves, the chief one being pro rata rights (right to buy more shares at later rounds). Since your friends & family are unlikely to be sophisticated enough to negotiate these in a way that won't scare off professional investors (who are allergic to "weird" terms), the right way to have them invest is through a convertible note (or apparently a SAFE, though that's new to me - maybe it's becoming common?), which will land them the same terms as your first priced round.
If I read between the lines of your post though, the real thing you need to work on is explaining how startup equity works to people who have never been involved in a startup before. This is a very worthwhile skill as you'll need it more often than you might expect with employees - even executive hires. Being sophisticated in business does not necessarily translate to being experienced with finance. It's OK to add people to your team who are clueless about equity & will try to negotiate weird clauses for themselves (it happens). You just need to find a low-stress way to handle these situations.
The two things you want to work on explaining in a friendly, feel-good way are:
1) How friends and family can get the same anti-dilution protections professional investors use.
2) How everyone can win with a smaller piece of a bigger pie (i.e. dilution is a good thing, not a bad thing). Yes, this is obvious & kind of concerning the nth time you explain it - the key is to find a way to explain it that is natural for you personally and treats the person you are speaking to as an equal rather than someone who is uninformed. It smooths out a lot of problems - but it only works if people don't feel talked down to.
Most people who you work with aren't greedy - they just want to be assured that they aren't going to feel foolish if the company is successful and that you personally "have their back." Communicating these two ideas in a friendly way is much more effective than creative financial terms (which you will always eventually come to regret doing no matter how clever it seems at the time).
When it comes to finance, keep it simple! Spend more time on relationships and less on unique terms (this rule goes for all stakeholders, including professional investors).