Son in Law

Himalaya took incarnation as jambavan 

1. Parvati Daughter of Himalaya Married Shiva
2. jambavati Daughter of jambavan Married Vishnu 

Agasthiar Glorifies Shiva and Narada Glorifies Vishnu

Agasthiar Glorifies Shiva and Narada Glorifies Vishnu
https://www.youtube.com/results?search_query=Agathiyar+Namasivaya+ena

Chiranjeevi Indra The Tiger Movie Shiva / Vishnu Songs

https://www.youtube.com/results?q=Indra+The+Tiger+Bam+Bam+Bhole
https://www.youtube.com/results?search_query=Jhoom+Jhoom+Ke+Payal+song+-+Indra+The+Tiger

Similarity

http://www.kamakoti.org/kamakoti/details/skandapurana3.html

Kings Queens

Generally Demon 

1. Kings were Devotees of Shiva
2. Queens were Devotees of Vishnu

http://8spt.blogspot.com/
 
Also 

1. Raja Rajasekhara Pandiyan  was Devotee of Shiva
2. Queen of Rajasekhara Pandiyan  was Devotee of Vishnu

 http://ayp8.blogspot.com/

Controversies

http://7hil.blogspot.com/2013/03/controversies-in-history.html

Rajinikanth Shiva Vishnu Song

https://www.youtube.com/results?q=Athanda+Ithanda
https://www.youtube.com/results?search_query=Devuda+Devuda

Brother and Sister

1. Laxmi and Moon are Brother and Sister
2. Having Appeared from Samudra(Ocean) During Samudra (Ocean) Manthan (Churning)
3. Moon Choose Shiva Head and Laxmi Choose Vishnu Feet

God of Medicine Hence Good Health

http://en.wikipedia.org/wiki/Vaidyanath_Jyotirlinga,_Deogarh
http://totreat.blogspot.com/2012/01/god-of-ayurveda-salutions-videos.html

Bhujanga Prayata stotram

http://shankarapath.blogspot.com/2014/03/shiva-vishnu-bhujanga-prayata-stotram.html

Pr Rama Murthy

http://prramamurthy1931.blogspot.com/