Question Summary:
I performed my Nikah without my sister and brother approval. Now is my Nikah valid?

Question Detail:

As salaam alaykum, I pray that this email found you in the best if eeman and health, Aameen. I got married almost 2 years ago In Shaa Allah when I was 32 years old and it was my second marriage from which I had a daughter(Alhamdulillah 10 years old now). Both of my parents died when I was a child, I lived with my 4 siblings, 2 of whom are older. I now live abroad, everybody lives separately, my maternal aunts and uncles live back home, I have no contact with my paternal family. When I notified my family of my marriage proposal, they wanted me to wait, parts of my family wanted me to try "it" out first by being his girlfriend and if it doesn't work out to break off the relationship and my sister was dead against any sort of relationships because the man wasn't"super rich", totally ignoring his religious side. I wanted a halal relationship and was he, so I refused all their propositions and with the support of my uncle and one maternal aunt, I performed my nikah without my sister and brother approval. Now is my nikah valid? I've heard that in second marriage, one doesn't need approval from sibling, is that true? I had an uncle/family friend as a wali. Please advise. Jazzak'Allahu khayran!

Answer :

Answer:
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
One does not need the approval of the siblings to marry, whether it is the first or second marriage. Your Nikah without the approval of your siblings is valid.[1]
 
And Allah Ta’āla Knows Best
Rabiul Islam
Student Darul Iftaa
Detroit, Michigan, USA 
Checked and Approved by,
Mufti Ebrahim Desai.