No, both are daughters of the Algerian wife of SM. I don't know very well details, and I don't know if this lady is still in Dubai and if she reacts to what happened to her 2 daughters.
Here is a photo of 12 years old Latifa with her mother Houria Lamara. And a photo of young Houria Lamara. Latifa entrusted photos and videos of her family to her close friends before her escape attempt with the instructions to use them as necessary.
MOTHERS DAY CALLS TO MOTHER OF KIDNAPPED PRINCESS LATIFA TO... - Detained International
Statement from Cptn Herve Jaubert on the custody battle between Sheikh Mohammed and his escaped wife Princess Haya
Captain Herve Jaubert is the former French spy who masterminded Sheikha Latifa's doomed escape attempt. He is her official representative and closest confidant. He felt obliged in this respect to speak out on her behalf in regards to the upcoming custody and divorce battle between Sheikh Mohammed and his escaped wife, Princess Haya
...
“It is clear to me and other experienced observers that Latifa Al Maktoum is being detained incommunicado and undoubtedly forcibly put under psychotic drugs the same way Shamsa was, and therefore is prevented from testifying before the UK court in a custody hearing between her father and Princess Haya, her step mother.
“The UK courts should bear in mind when determining Sheikh Mohammed’s suit for custody over his and Princess Haya’s children that this is a man who kidnapped his own daughters because no legal process could return them to him. This is a man who has used psychotic drugs on at least three of his daughters to subdue them. This is a man who has jailed his own daughters and even had them tortured.
“Sheikh Mohammed disregards any foreign laws when they don't fit his agenda. The same way he disregarded UK laws to kidnap Shamsa in Cambridge, and the same way he disregarded international laws (in International Waters) to kidnap Latifa from a vessel under US jurisdiction.
“It is inconceivable to me that any court in Great Britain, free from undue political influence, could grant custody of those children to Sheikh Mohammed under any circumstances. If custody was granted I do not believe that Princess Haya would ever see her children again.
“Even if partial or shared custody were granted, I am certain that the first time the children went to the UAE they would become captives and never allowed to see their mother, Princess Haya, again.”
Jaubert's whole statement
Statement from Cptn Herve Jaubert on the custody battle between... - Detained In Dubai