Global sea levels rose by an average of 1.8 millimetres per year from 1961 to 2003, according to data from tide gauges.
...my mother in law could jump in the ocean and make it rise that much.
Global average sea level rose at an average rate of around 1.7 ± 0.3 mm per year over 1950 to 2009 and at a satellite-measured average rate of about 3.3 ± 0.4 mm per year from 1993 to 2009.
...you're gonna need more mother-in-laws.