My aunty has 2 boys (my cousins), Tyler (he's 5) has a nephew that is 1 year older than him and 3 (soon to be 4) nephews younger than him. Mathew (he's 4 months old) has 4 nephews that are older than him and one on the way that will be younger lol. It's cuz my uncle remarried my aunty (his 3rd wife :/) and already had 3 other kids, oneis a year older than me (she's 24), one that is 18 and one that's 16. His daughter has 4 boys and one On the way lol.
It's kinda confusing! But it's also amazing that your mum is pregnant! She must be quite young... My mum is 45 and has had a hysterectomy so no more for her lol.
Congrats to you both!!!
XxX