If the property is shared with non-immediate family member, then you are strongly recommended to get the report done. While a site visit is unlikely, you may get inquiry about accommodation, and landlord may be contacted.
Thanks Joppa. I own the property on mortgage. When i will be applying my sister ,with her three kids, will be coming over to spend holidays with me for three months.So want to make sure if any issue will arise if she stays with me for that time period.