Are you going to rain tomrorow at my sister's? 
[IN:GET_WEATHER Are you going to [SL:WEATHER_ATTRIBUTE rain ] [SL:DATE_TIME tomrorow ] at [SL:LOCATION [IN:GET_INFO_CONTACT my ] [SL:CONTACT_RELATED sister ] 's ] ] ?  ]
[IN:GET_WEATHER Are you going to [SL:WEATHER_ATTRIBUTE rain ] [SL:DATE_TIME tomrorow ] at [SL:LOCATION [IN:GET_INFO_CONTACT my ] [SL:CONTACT_RELATED sister ] 's ] ] ?  ]