Family foundation… but what vehicles?

Hi, I hope to get some good advice here in the forum I and my friend are now waiting for our first child. At the moment I drive a 118d and they a Astra f. Both rather not advantageous for the upcoming situation. The following consideration is in the room. I am looking for a combo that offers enough space. My friend should get a vehicle in which she can store the stroller and possibly additional smaller purchases. I thought for myself a budget of c a. 14.000€. In my eye I had BMW 320d, BMW 520d, Opel Insignia or Hyundai i40. Unfortunately I am totally undecided about space and of course also about driving fun and comfort. For my friend I thought about a budget of about 6.000€ so rather in the direction of an older 320d or A3 SB. Since we already think about a second child I do not want to have to look for a new one in two years already Has someone experiences or possibly even suggestions? I thank already now d a I absolutely don’t know any more 😛