You won't get actual dates of births, deaths, and marriages, you will get the year, and quarter in which they were registered, unless you can find the marriage banns, which are available in quite a few cases. The BMD records are available from 1837 to 2005.
You will have to search separately for children of the marriage, so for instance if Smith married Jones in 1936 I would search in births for children named Smith, with a mother's maiden name of Jones, born in 1936 plus or minus 10 years, in the location you think they lived.
If you want to check families prior to 1911 you would use the censuses available on ancestry which date from 1841 every 10 years up to 1911.