Hindsight is brilliant, I agree with Ady and Ken re RMA, however looking at the lady, The pigeon breasted blouse became fashionable around 1902 and the hairstyle was probably called a "Gibson Girl" style, hair piled up onto a horsehair pad called a "rat".. so with the Teddy and all I would say 1903 - 1905 given that they look rather affluent and would not have kept the style until later in the decade as others with lesser means may have had to.
I googled pigeon breasted blouse and wikipedia did the rest.
For more in depth and accurate info on the fashions may I suggest you post this onto the Photographic restoration and dating board where Jim and China will probably date it to the month or season.
Regards
James