I come from 3 under 4 and whilst my parents are comfortable, (6 figure salary, 6 bedroom house, I had a pony as a child, etc etc) university was financially crippling for them. My sister the oldest took a gap year, so her and I went together for the duration (my course was 4y and hers was 3, (we both worked through uni) then my sister did an NHS degree 18 ish months later January entry - and due to placements on nursing couldn’t really get a job, aside from the odd bar shift) so for the first 2 years they had 2 at uni, then midway through this second year for the older two in the January first year for my little sister started all three of us were at uni at the same time for 20 odd months, then my 4th year was DS’s second/third year, and her final six months from July when I graduated to January when she did was just her.
its wise to think about your ages and the nature of your work too, my dad had a very demanding job, that he had done for many years, and ideally would’ve looked to go down to part time/semi retirement around the time my youngest sister left school, but due to uni costs they had to remortgage and extended their term by 5 years to keep some quality of life, which was difficult I think for them.
the other thing to note is how much a third pregnancy will affect your body. I flew through the first two pregnancies (I left hospital with my last child at two days postnatal in a pair of size eight non stretch skinny jeans, and I air wrapped my hair and did my make up before I left the bloody hospital room) I am not old now, (early-mid 30’s) first pregnancy was in 2017, second in 2020, third due any second now.
I am a regular weight pre baby, have a healthy diet, do my pelvic floor exercises, delivered vaginally and unmedicated and so on and so forth, but I am on my arse. I feel like I have been hit by a bloody train, I’m exhausted, I’ve put on nearly 4 stone, have been incontinent of urine since I was 18 weeks pregnant, I have PGP, I had HG from 5-36 weeks. It’s been incredibly tough, And my pregnancies have been nine years apart with many years breaks in between. (All girls too so nothing odd about this time round!)
that said I absolutely adore my sisters, we are so close and it’s the best thing ever! So I wouldn’t say don’t do it at all there are ways and means.