Reversing in a FWD

[Windsor342ci]

Hi guys,

A question that Ive been arguing with my family about for years....

Every month or so the family get together at mums house for a BBQ or something along those lines, With her limited driveway space some of us are forces to park on her grass...... (In the world of maltese thats either perfectly fine because there are only a bunch of XY or XU1 parts everywhere, or a big no no as the grass has been babied for years )
Anyway 2 of my sister own FWD cars, an Auto Magna and a Manual Corolla. The one with the Corolla is a bit more risky and is happy to park at the bottom of the grass. The problem here is mum whole front yard is on a downhill slope something extreme... Our argument has always been, when reversing out,
a) have your family in your car (my argument)
or
b) go in by yourself and reverse out alone, once your at the top load the family which consist of brother in law plus 3 nephews 10 and under (there argument)

My question is what is better? I believe load the car up 1st with the weight so you've got more pressure on your tyres therefore less chance to wheel spin when reversing out. But there argument is to reverse out lighter so theres less gravity pushing down the hill.... I see the logic behind it but I just thing if you pack down the car with extra weight it will just be better....

Your thoughts people?