I asked my sister to call me on skype so I could be there for our mom's 60th birthday

[B45]

I asked my sister to call me on skype so I could be there for our mom's 60th birthday party.

I say on my mom's birthday: I asked Michelle to set it up so I could/can be here with you mom!

Are both okay here?

 

[MikeNewYork]

I would use "could".

 

[B45]

Why would you use could?

 

[MikeNewYork]

Because the arrangements were made in the past.

 

[Barb_D]

... so I could be here with you, Mom.

 

[emsr2d2]

These days, most people don't bother with "call me on Skype". Skype has become an accepted verb.

I asked my sister to Skype me ...