Tetney is about twenty odd miles to the north east of Middle Rasen. It is on the other side of the Lincolnshire Wolds, an escarpment that dominates the local area.
There is no reason why there could not be a family connection, but it is quite a distance with no direct road link. Across country in those days would have been difficult because the fens had not yet been fully drained.
This is the county of Lincolnshire, which in the seventeenth century was the second largest county in England after Yorkshire. Just like Yorkshire it was divided up for administrative purposes.
These places were both in the Parts of Lindsey (the term 'Parts' was the name given to each of the three divisions of Lincolnshire). However, each Part was then also subdivided. Tetley was probably in the East Riding of the Parts of Lindsey, whereas Middle Rasen was either in the West Riding or the South Riding - I cannot remember off the top of my head!
As I say, it is not impossible that they could have met, but not easily unless one had business in the others area - or the family had moved!