Ihraam

Putting on ihraam in Jeddah if going there to meet relatives and staying there for a few days

Q: I intend performing Umrah for my deceased parents. I’m travelling to Jeddah and staying for 2 days with my niece who resides there. After I finish Umrah I will go back to Jeddah for a week and then to Doha for 2 days. 

When and where do I don Ihraam? 

Can I perform 1 umrah for both my parents?