Three times.
She married the man who is the father of her children in a "Muslim" ceremony. She then divorced her husband and married the man who claims he is not her brother. This second man received an immigration visa and now resides in Great Britain where he refuses to discuss his marriage to Omar. She then divorced "not her brother" and remarried her first husband in a civil ceremony and received a marriage certificate.
One might think that Omar was sowing her wild oats, testing the waters of different relationships before returning home to her first husband. I don't. I'm pretty sure Somali Muslims don't let their daughters go from man to man.
I believe the second marriage was never consummated and was a sham marriage Omar engaged in specifically for the purpose of committing immigration fraud. It is noteworthy that her first marriage was an Islamic ceremony while the other marriages and divorces were civil affairs.
There has been an amazing lack of curiosity among the press in investigating this.