Some times records are not available. We as genealogists don't just fly by the seat of our pants. We dig and find evidence to support or disprove the relationship. When we have enough evidence to support our theory, we list it as possible. When we have strong evidence to support our theory we list it as probable. So to answer your question, it is permissable with suficient disclaimer in the bio and uncertain on the main page, Anything unsupported and far fetched should not be kept. On each page there is an icon "Ask a Question" when you click on this give us as much information as you have on that person and we will try to help.