Aqaaid

Is the following statement sinful?

Q: My wife is pregnant Alhmadulillah. It's still the beginning of her pregnancy, but I try to buy the baby's things bit by bit to get good offers instead of buying everything last minute. My father told me not to buy so much yet and I answered something like "But at last minute one doesn't have all the money at one time". I know Rizq is from Allah and he could give me as much as he wants any time. What I meant is that I am planning on the grounds of what I have now (monthly). Is that statement and this approach sinful or even kufr? I regret saying it like that.

Laylat ul qadr and taqdeer

Q: What's the link between laylat ul qadr and our taqdeer? i.e.: on the one hand, the pen's ink is already dried, and on the other hand, laylat ul qadr means the night of destiny. So would that mean that each year when laylat ul qadr happens, Allah can change our taqdeer?

Family relations in Jannah

Q: Being a Muslim After the judgement day and completion of Jaza and Saza process.  Shall we get our relationship as Quran or hadith like, Mother Father, Sisters, Brothers, Children, Wife etc? Kindly give reference to study if possible from Quran or Hadith.

Dua Naad e Ali

Q: I came across a Sunni Version of Dua Naad e Ali, by reading it the dua looks very good to me, could you please let me know if reading this dua is permissible and also let me know its meaning in English.