The Visitor

Robert and his wife have had some strife, so they're moving somewhere else for a new life, to the home his wife was raised, where she started all her days, hoping joy and happiness will all be rife. It's a strain for Robert moving to this place, when under covers he discovers another face, a painted lookalike, the resemblance is a strike, not the last he'll find that occupies a space. Soon alarm bells start to sound and ring out loud, at the church there is a weird and eerie crowd, then his wife gets fertilised, things settle down, anxiousness dies, thoughts turn to names, a baby boy to get baptised.

It's not the most original variation on a theme but it has one or two tangents that may (or may not) raise an eyebrow or two, but ultimately a recycling of things you've encountered many times before.