I was thinking it might be worth your while contacting present day McAteers, still in the Portglenone area to find out about Margaret, especially since records in 1900s are scarce to come by at the moment. With this in mind I checked out the telephone directory and found a few still living there:
E McAteerTel: (028) 2582 2678 - Text Number
8 Sperrin Heights, Portglenone, Ballymena, BT44 8BQ Ian McAteer<o:p></o:p>
Tel: (028) 2582 1584 - Text Number
43 Beechland Dv, Portglenone, Ballymena, BT44 8NJ L.J McAteer
Tel: (028) 2582 2343 - Text Number
215 Mayogall Rd, Portglenone, Ballymena, BT44 8NN Matt McAteer<o:p></o:p>
Tel: (028) 2582 1452 - Text Number
20 Ballymacombs Rd, Portglenone, Ballymena, BT44 8NQ
Willie John McAteer
Tel: (028) 2582 1705 - Text Number
203 Mayogall Rd, Portglenone, Ballymena, BT44 8NN
If you do decide to write, it is a good idea to include your email address. Many people lead such busy lives that they may not find time to write back to you, but can manage to send an email.
If you decide to follow these through then good luck!! I hope it proves fruitful.
Teri