Landlord Put A Pause (?) On Us Moving In

(TL;DR at the end)

I’m not sure if the title really describes what happened but basically a few weeks ago (and after literal months of apartment hunting) me and my family finally found a nice apartment. We met up with the broker, he took us to visit the apartment and we just absolutely fell in love with it. We agreed to take it and so he set a date for us to meet the landlord.

Fast forward a few days and we meet the guy, he goes over some documents that he requested, we answer any and all questions he had about us, we went over some terms of agreement, overall everything was going great. Him and my dad shook on it, and then my father payed the broker fee and a day or two later he signed the lease. We received the keys & were told we can move in immediately if we wanted (may 20th) and have to start paying by June 1st. Fantastic. We started packing up and disassembled whatever furniture we could, threw old clothes/items, we wanted a different color for the walls so my dad spent around $300 on paint and me and him went over to the apartment and painted it all , we transferred some of our items over before the big moving day and then out of nowhere the broker calls my dad and he’s like “haha wait, actually his wife is asking for more documents and she doesn’t agree to you moving in” EXCUSE ME ???????????????? She asked for more documents as proof of income (we already provided everything the landlord asked for) but it seems she wasn’t convinced. Okay???? But as it ACTUALLY turns out, her nephew is also a broker/real estate agent and she wants him to be the one selling it off for that extra cash. She even put it back on the market. What the fuck ? Idk what her plan is but is she even allowed to do this ? Technically since we already got the keys and signed the lease doesn’t that already mean we got it ? Can she really kick us out before we even moved in? And honestly this emotionally fucked us all up we were so excited to move in. The broker is meeting up with her tomorrow to talk it over but it’s not looking good tbh. Should we be worried or is she all talk ?

TL;DR: We met with the landlord, we signed, we payed, we received the keys, we were set to start living there by June 1st, we moved in half our stuff already, painted the entire fucking apartment which cost us a little over $300 and it was EXHAUSTING , our current apartment is a mess and half empty, but then landlords wife is like nope, fuck you and what my husband agreed on I’m the real boss and I want my little nephew to get the broker money so she’s asking for more documents to either stall (?) or try to find something to say no to. Is this allowed ? Is this legal ? Do we just sit and do nothing ?