"That the said (grantor) is seized of the said premises and has good right to convey the same." Under this covenant the grantor guarantees that he owns and is in possession of the property and that he has good right to sell it. This covenant relates to the time of the transfer and naturally if broken at all, is broken at the time of delivery of the deed. Any right of action under it commences to run from that time. The purchaser may recover from the seller, in case of breach of this covenant, whatever his expense may be up to the amount he paid for the property.