Opinions. *long post*

So i will have 4 kids in April. 3 boys and a girl. (One is a step child who is only here every other weekend.) The 2 oldest boys are 5 years old (almost 6 when new babe is born) and they share a room. Its the houses bonus room so its big. My 3rd child will be 1 years old when my newest baby is born. But i dont feel like my son who will be 1 will be ready to move into his brother's room when the baby comes and i feel kinda guilty that id be "kicking him out of his room for the new baby". His brothers a great with him and he only wakes up once a night right now at 8 1/2 months old ( he was 6 weeks early). But i just feel like thats a big age gap between the older boys and him. But theres not enough room in my youngest sons room for 2 cribs or a crib and toddler bed. So i was thinking of just using my sons playpen and buying a mattress to go into it to use for the new baby and the two youngest can share a room until my youngest son is like 2 years old. But then again i feel guilty that baby girl wont have a "real bed". I know she'd grow out of a bassinet fairly soon after birth but i have no idea what to do about room arrangements 😣 theres no room for a baby bed in my room. (This was a very unplanned pregnancy. We used protection, im not able to be on birth control due to cervical cancer concerns, and we kinda just got lost in the moment. ) any ideas on what to do?