Not a twin. My mother was there, as was a nurse. Unless you want to get into a tedious descartian discussion on whether the mother and nurse were actually there, in which case I put up my hands and merrily say of course you can only know that you exist. That being the case, I will leave you to your self-debate whilst the rest of us (who may, or may not, exist - but strangely we are not too fussed about that) are down the pub having a (metaphysical or physical - again, we do not much care) pint.