Back to the US, once per calendar year - sometimes longer or shorter than 12 months, depending on timing. We were there last around Easter 2006, and will not be going back until sometime this autumn (so about 1 1/2 years this time between visits).
Mom's in a nursing home & it's doubtful she'll know me this time - but we always go to visit her. I may not see both brothers each visit, because everyone is so spread out (Mom-Kansas, Brother-Atlanta, Brother-Baltimore, Friends-Maine, some of my things still in storage-Florida). We only go for two weeks & once you've done all the internal flights, etc - it's exhausting & expensive, so we just can't see everyone each time.
No one comes here to visit - some can't or don't like to travel, others think that Britain is simply too expensive for someone paying in dollars. Four people came to our wedding here in England, but that was in 2004.